Does anyone know what to do with the manifold vapor tube on a TPI Vette motor? I've come to the conclution that it is something like a overflow for the radiator. Am I going to need this if I run a radiator with a overflow tube coming out of the filler neck? So what the heck should I do with this thing , plug it , tap it into the heater hose , what??? I think LT1 motors have them also but not positive.